The fleur-de-lis (or fleur-de-lys, plural: fleurs-de-lis. Translated from French as "lily flower") is a stylized design of either an iris or a lily that is now used purely decoratively as well as symbolically, or it may be "at one and the same time political, dynastic, artistic, emblematic and symbolic", especially in heraldry. While the fleur-de-lis has appeared on countless European coats of arms and flags over the centuries, it is particularly associated with the French monarchy on a historical context, and nowadays with the Spanish monarchy as the only remaining monarchs of the House of Bourbon.

It is an enduring symbol of France that appears on French postage stamps but has not been adopted officially by any of the French republics. By contrast, as Spain is a constitutional monarchy, the fleur-de-lis is associated with the Spanish King Juan Carlos I (of Bourbon descent) and the Kingdom of Spain. In North America, the fleur-de-lis is often associated with areas formerly settled by France, such as Quebec and Louisiana and with the Francophones in other Canadian provinces. It is also the emblem of the Italian Province of Florence, having been added to the Medici palle in the fifteenth century, and of the Swiss Municipality of Schlieren, Zurich. The flag of Bosnia-Hercegovina from 1992-1998 contained several fleurs-de-lis. The New Orleans Saints NFL team has the fleur-de-lis on it's helmets.